Production of thin hot strips of high silicon bearing FeSi-strip using the integrated technology of thin slab casting and hot rolling

采用薄板坯连铸热轧一体化技术生产高硅硅铁薄带材

• 批准号: 255681924
• 负责人: Professor Dr.-Ing. Rudolf Kawalla
• 金额: --
• 依托单位: Institut für Metallformung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/255681924?language=en
• 关键词: Production; thin; hot; strips; silicon

Within the first phase of the project, various hot rolling strategies weredeveloped for the production of a thin, 1 mm thick hot strip of the Fe-2,4 wt.-% Si alloy using the conventional hot rolling process withprevious reheating and the integrated thin slab casting technology.The interactions of the individual process steps and the influence ofthe hot strip on the magnetic properties could be demonstrated. Withboth methods of hot strip production, it is possible to roll different hotstrip structures and textures for hot strip thicknesses between 1 mmand 2.5 mm. The hot strip states like hardened, partially softened andsoftened could be realised. Significant differences in texture withmagnetically advantageous and unfavorable textures were foundacross the strip thickness. The hot rolling process was investigatedexperimentally and simulatively. For this purpose, the hardening andsoftening behavior was investigated experimentally and simulativelydescribed by semi-empirically and physically based models. For aholistic view of the production of non-grain-oriented electrical sheetsand of the continuous process modeling, the modeling of the materialflow and the microstructural development after hot forming is anessential component with the layer model developed at the IMF as thebasis. The influence of the hot strip on the structure of the finalannealed samples and on the magnetic properties was also analyzed.In the second phase, the simulation of the hot rolling process and themicrostructure development during hot rolling as well as theexperimental work will be continued. Aim is to define hot stripstructures for specific applications with defined magnetic properties,to produce them in a targeted manner and to derive applicationorientedhot rolling strategies. Therefore, in cooperation with the othersubprojects of the research group, using an alloy with a high Sicontent (2.8 wt.% Si) is planed. This makes it possible to investigatethe influence of the alloy on the production process, especially hotrolling, the material behavior during hot forming and the effects on themagnetic properties. Based on the findings of the first phase of theproject, a thin hot strip is produced with a favorable initial state for thecold rolling and for the magnetic properties by means of adaptationsof the rolling strategies, whereby the intended hot strip annealingoffers further possibilities of the microstructure setting. The alteredhardening and softening behavior of the alloy with high Si content willbe also taken into account. The submodels of the individual processstages are linked to one another in cooperation with the projectpartners with the aim of experimentally imaging the theoreticallyderived process parameters and producing a non-grain-orientedelectrical sheet adapted to the defined requirements of thedemonstrator.

在该项目的第一阶段，开发了各种热轧策略，用于生产Fe-2.4wt.-%的薄的1 mm厚的热轧带。采用常规热轧工艺和薄板坯连铸连轧工艺，研究了热轧过程中各工艺步骤的相互作用以及热轧带钢对磁性能的影响。对于厚度在1 mm和2.5 mm之间的热轧带钢，这两种热轧带钢生产方法都可以轧制出不同的热轧带钢组织和织构。可以实现热轧带钢的硬化、部分软化和软化状态。在整个带材厚度上发现了有利和不利织构的显著差别.对热轧过程进行了实验和模拟研究。为此，对该材料的硬化和软化行为进行了实验研究，并采用半经验和物理模型进行了模拟描述。对于非晶粒取向电工钢生产和连续工艺建模的整体观点而言，以IMF开发的层模型为基础，热成形后材料流动和微观组织发展的建模是一个重要组成部分。分析了热轧带钢对最终退火样品组织和磁性能的影响。在第二阶段，将继续进行热轧过程的模拟和热轧过程中的组织发展以及实验工作。目的是为特定应用定义具有特定磁性能的热轧带钢结构，以有针对性的方式生产它们，并导出面向应用的热轧策略。因此，与课题组的其他子课题合作，使用高Si含量（2.8wt.%）的合金，（1）被规划。这使得研究合金对生产过程的影响，特别是热轧，热成形过程中的材料行为以及对磁性的影响成为可能。基于该项目第一阶段的研究结果，通过调整轧制策略，生产出了具有良好的冷轧初始状态和磁性能的薄热轧带，从而预期的热轧带退火提供了进一步的组织设置可能性。高硅合金的硬化和软化行为也将被考虑。各个工艺阶段的子模型与项目合作伙伴相互联系，目的是通过实验成像理论推导的工艺参数，并生产出符合演示器定义要求的非晶粒取向电气板。